* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
	font-family: "Poppins", sans-serif;
}

html,
body {
	/* background-color: #000000; */
	display: grid;
	height: 100%;
	place-items: center;
	overflow: hidden;
}

.btn-6{
  position: relative;
  padding: 10px 30px;
  margin: 0 45px;
  color: #21ebff;
  text-decoration: none;
  font-size: 20px;
  text-transform: uppercase;
  transition: 0.5s;
  overflow: hidden;
  -webkit-box-reflect: below 1px linear-gradient(transparent, #0003);
}
.btn-6:hover{
  background: #21ebff;
  color: #111;
  box-shadow: 0 0 50px #21ebff;
  transition-delay: 0.5s;
}

.btn-6:nth-child(1){
  filter: hue-rotate(115deg);
}
.btn-6:nth-child(3){
  filter: hue-rotate(270deg);
}

.btn-6::before{
  content: '';
  position: absolute;
  top:0;
  left: 0;
  width: 10px;
  height: 10px;
  border-top:2px solid #21ebff;
  border-left:2px solid #21ebff;
  transition: 0.5s;
  transition-delay: 0.5s;
}
.btn-6:hover::before{
  width: 100%;
  height: 100%;
  transition-delay: 0s;
}
.btn-6::after{
  content: '';
  position: absolute;
  right:0;
  bottom: 0;
  width: 10px;
  height: 10px;
  border-bottom:2px solid #21ebff;
  border-right:2px solid #21ebff;
  transition: 0.5s;
  transition-delay: 0.5s;
}

.btn-6:hover::after{
  width: 100%;
  height: 100%;
  transition-delay: 0s;
}